Calling device



Oct. 30, 1923.

J. T. E. HILLHOUSE CALLING DEVICE Filed Dec. 24'. 1920 fizyizfor Patented (Jet. 30, 1923.

UNETEE STATES $72,595 FATENT QFFEQE.

JOHN '1. E. HILLHOUSE, OF NEW YORK, N. Y., ASSIGNOR TO l/VESTERN ELECTRIC COlVf- Pm, INCORPORATED, OF NEW YORK, N. 1., A CORPORATION OF NEW YORK.

CALLING DEVICE.

Application filed December 24, 1920. Serial No. 432,965.

To all whom it may concern:

Be it known that 1, JOHN T. ELHILL- HOUSE, a citizen of the United States, residin at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Calling Devices, of which the following is a full, clear, concise, and exact description.

This invention relates to calling devices and more particularly to impulse senders for automatic telephone systems in which the selector switches used for building up a connection are directly controlled by current impulses sent from a subscribers station.

The object of this invention is to provide an economical'and efficient unitary arrangement of a telephone transmitter and an impulse sender.

One feature of the invention is in the mounting of an impulse sender concentrically with and in the same case as the trans mitter. 7

Another feature is in the arrangement of the transmitter parts to rotate with and form part of the impulse sender.

Still another feature is the structure of the governing device in which the speed of the rotating parts is regulated by changing the effective length of the governor arms.

-Another feature is in the frictional connections between the device and the telephone set, provision being made whereby the contact springs maintain ractically the same tension regardless of :t e position of the terminals making contact therewith.

With referencev to the drawings which showan embodiment of this invention, Fig. 1 represents a sectional view through the calling device, transmitter and support. Fig 2: shows a front elevation-with parts broken away. Fig. 3 is a section-showing the governor. Fig. 4 is a plan view part in section. Fig. 51s a detailed view of the contact springs and contact breaker. Fig. 6 shows a section through 6-6 in Fig. 1.

The various parts of the impulse sender and the transmitterare mounted on arm 1, which is pivotally secured to holder 2 in such a manner as to provide a limited movement of the device in a vertical plane. Rigidly secured to arm 1 is a bell shaped case 3 for enclosing the various parts, and frame awhich has a dished portion 5 with arms 6 extending parallel to the axis of the dished;

section. The ends of arms 6 are bent out- 20 and a front wall 22 inthe threaded enshafts l0 and 62; Shaft 10 projects beyond V shaft 62. Secured on one end of shaft 10 ad acent to framed is pinion 11, carrying a spring aotuatedpawl12, which operatively engages ratchet wheel 13 rigidly supported on one end of shaft 62 adjacent to lnion 11. On the opposite end of shaft 62 1s fastened pinion 1 1 which is driven by gear 30 and on the adjacent. end of shaft-.10 is provided a breaker arm 15 for operating springs 16. f

Rotatably secured to arm 1, in a longitudinal opening therein, is a hollow shaft 17 having a reduced portion on which is wound motor spring 18. One end of motor spring 18 is fixed to shaft 17 and the other end to washer 19 which is provided with projections for engaging grooves in the arm 1 to prevent rotation of the washer. On the other end of shaft 17 and centrally secured thereto is a transmitter having a rear wall gagement therewith.

Glamped between the front and rear walls is the usual diaphragm 21. The rear wall 20 has a depression therein forming the car bon chamber, which contains a front electrode 26 held in engagement with the diaphragm by spring 27 and rear electrode 23 which is provided with a conducting rod 2 1 projecting through shaft 17 and insulated therefrom. Rod 24 terminates-in contact 25.

Washer '19has a tapered opening and that portion of shaft 17 passing through-it has a corresponding taper. The end of the shaft'is threaded and provided with nut 58.

Spring 18 may therefore be wound to its required tension, before the shaft is inserted in-arm 1, by tightening nut 58 so as to bind the washeron the shaft after the spring has been wound. After insertion in arm 1, nut 58 is loosened sutficiently to release'washer 19 from shaft 17. Nut 58 then serves as a seat for retaining nut 59 which loosely rests on thrust washer 60 holding shaft 17 in arm 1., Nut 61 provides a lock. for thrust washer 60. 1

The front wall 22 is provided with a 1101-" low cylindrical projection forming the orifice of the transmitter and on which projection is rigidly secured sender dial 28 having circular openings 54.- therein opposite the markings on number dial 8 and mouthpiece 29, also mounted on this projection is gear 30 adapted to engage with pinion 14:.

Rotatably carried on arm 1 is tube 31 having an enlarged portion 32 provided with an outwardly projecting flange 33 on which flange are pivotally mounted governor arms 37 and 38. Tube 31 is provided with gear teeth which engage gear 11 through intermediate gear 3e rotatably secured to bridge 4. Interconnecting governor arms 37 and 38 are springs 39 and 40. Associated with the smaller ends of arms 37 and 38 and positioned diametrically opposite each other are friction studs 41 and 42 loosely carried in ring as which is adjustably secured to flange 33. Under the action of the governor arms, these studs frictionally engage the outside circumference of the depression in rear wall 20 or" the transmitter case to control the speed of rotating parts. The contact pressure between wall 20 and the studs may be regulated by rotating ring 43 and thereby changing the relation, of the studs with respect to the governor arms. Supported on ring '9 and insulated therefrom is a set of circuit controlling springs 44, 45and 46 which may be operated by lug 47 on the periphery of the front wall 22.

The connections to the calling device and transmitter may be made through terminals such as 49, 25 and 48 having frictional engagement with springs such as 50, 51 and 52 which are insulated from, and rigidly support-ed with reference to holder 2. The portions of springs 50, 51 and 52 which engage with contacts 25, d8 and 49 are in the form of arcs of circleswith pivot 3 as a center, so that the tension in the contact springs will be practically the same regardless of the position of arm 1 on holder 2.

Other details of construction will be understood from the following description of the mode of operation of the device.

' Supposing that the user desires to send out for example, a signal corresponding to the number 5, he engages the hole in dial 28 oppposite which hole the character 5 appears and rotates the dial in a clockwise direction until stationary stop 55 is reached. in response to the actuation of dial 28, shaft 17 and the transmitter parts and gear 30 carried thereon are rotated in a clockwise direction. Gear 30 meshing with gear 14 causes shaft 62 on shaft 10 to rotate in a counter clockwise direction. Fixed on shaft 10 is pinion 11 provided with pawl 12 which slips over the teeth in ratchet 13 permitting contact breaker arm 15, pinion 11, gear 34: and tube 31 to remain inactive during the setting of dial 28.. Secured to flange 33 on tube 31 is the governing device. It will, therefore, be seen that the governor does not operate or exert any speed controlling action while the dial is being set by rotation in a clockwise direction.

When the user releases dial 28, that is, removes his finger from the engaged finger hole, shaft 17 and the elements fastened thereto are rotated in a counter clockwise direction by the power stored up in motor spring 18. Spindle 62 being driven in a clockwise direction drives shaft 10 and pinion 11 through pawl 12 and ratchet 13. interrupter arm 15 rotates in the direction shown by Fig. 5 and passes between contact springs 16. In the example cite-d, arm 15 will make 5 complete rotations opening and closing the contacts 5 times, thus sending out a. series of five impulses which serve to govern a switch in its selective movement in a well known manner. Pinion 11 drives tube 31 through gear 34, rotating the governor arms 37 and'38 which, due to their centrifugal force fly outwardly thus creating a pressure against rubber friction studs 41 and 4&2, forcing them in engagement with wall 20. studs il and 42 and wall 20, the rotation of the mechanism is maintained at the desired speed which is determined by the position of studs ll and 4:2 with respect to pivots 35 and 36. The position of the studs may be changed by rotating ring 43, provided with an adjusting lug 56 which engages with screw 57.

It will be noted that during the action of dialing or sending or" a number, the granularcarbon in the transmitter rotates with the calling device, this agitates the carbon and relieves any packed condition which may have resulted from a previous use of the instrument.

What is claimed is:

1. A calling device having in combination, a rotatable member, and a transmitter, said transmitter adapted to rotate with said member.

2. A calling device having in combination, a rotatable shaft, and a transmitter, said transmitter co-axial with said shaft and adapted to rotate therewith.

3. A calling device having in combination, rotatable members, a governor therefor, and a transmitter, said governor adapted to engage said transmitter to control the speed of said members. 7

i. A calling device having in combination, a rotatable member, a transmitter case, and a governor engaging said case to control, the movement of said member.

5. A. calling device having in combination, a rotatable member, a governor concen- 'tric therewith and rotating opposite thereto, and means interposed between said gov- Due to the friction between the ernor and said member to frictionally engage said member under action of said governor.

6. A calling device having in combination, a rotatable shaft, a transmitter integral therewith, means for rotating said shaft, and means for controlling the speed of said shaft, said means consisting of a governor symmetrically disposed with respect to said shaft and adapted to engage said transmitter.

7. A calling device having in combination, an interrupter, a transmitter, and a driver for said interrupter, said driver associated with said transmitter.

8. A calling device having in combination, an interrupter, a transmitter, and a motor spring cooperating with said transmitter to drive said interrupter.

9. A calling device having in combina tion, a transmitter, an interrupter, a driver for said interrupter, and a governor coopcrating with said transmitter to control the action of said driver.

10. A calling device having in combination, an interrupter, a transmitter, a governor, and a driving means, said transmitter, governor and driving means having coaxial relation and. cooperating to actuate said interrupter.

11. A calling device having in combina tion, an interrupter, a governor for control ling said interrupter, and a rotating transmitter coaxial with said governor.

12. A calling device having in combina-' tion, means for sending impulses, a governor for said means, and a rotatable transmitter coaxial with said governor.

13. A callin device having in combination, a rotata 1e member, a transmitter adapted to rotate with said member, governor arms for controlling the speed of said members, and means for varying said speed, said means comprising an annular ring, friction studs loosely carried thereon, and means for adjusting the position of said studs in relation to said governor arms to change the speed of said rotating member.

14. In a telephone device comprising a transmitter, a supporting arm therefor adjustably mounted on a holder, a set of con tact members carried on said arm, a second set of contact members supported on said holder and adapted to make contact with the first said set of contacts, and means for maintaining uniform contact pressure regardless of the position of said arm on said holder.

15.7111 a, telephone device comprising a transmitter, a supporting arm therefor, a holderfor said arm, a pivot for adjustably securing said arm-to said holder, a set of contacts carried on said arm, and a set of contact springs supported on said holder and adapted to engage said contacts, said contact springs having their ends shaped in arcs having radii equal to the distance of the contact members from said pivot.

In witness whereof, I hereunto subscribe my name this 20th day of December A. D

JOHN T. E. HILLHOUSE. 

